U.S. patent application number 14/972864 was filed with the patent office on 2016-04-14 for methods for detecting and sending downlink control information and devices.
The applicant listed for this patent is Huawei Technologies Co., Ltd.. Invention is credited to Chi Gao, Jianghua Liu, Kunpeng Liu.
Application Number | 20160105875 14/972864 |
Document ID | / |
Family ID | 52103793 |
Filed Date | 2016-04-14 |
United States Patent
Application |
20160105875 |
Kind Code |
A1 |
Liu; Kunpeng ; et
al. |
April 14, 2016 |
METHODS FOR DETECTING AND SENDING DOWNLINK CONTROL INFORMATION AND
DEVICES
Abstract
Embodiments of the present invention provide methods for
detecting and sending downlink control information and devices. The
method for detecting downlink control information includes:
acquiring a pilot port determining parameter that corresponds to
downlink control information needing to be detected; determining,
according to the pilot port determining parameter, a first-type
pilot port that corresponds to the downlink control information;
and detecting the downlink control information according to the
first-type pilot port. In the embodiments of the present invention,
user equipment can correctly detect downlink control
information.
Inventors: |
Liu; Kunpeng; (Beijing,
CN) ; Gao; Chi; (Shenzhen, CN) ; Liu;
Jianghua; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Technologies Co., Ltd. |
Shenzhen |
|
CN |
|
|
Family ID: |
52103793 |
Appl. No.: |
14/972864 |
Filed: |
December 17, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/CN2013/077396 |
Jun 18, 2013 |
|
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14972864 |
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04L 5/0048 20130101;
H04W 48/16 20130101; H04L 5/0053 20130101; H04W 74/006 20130101;
H04L 5/0023 20130101; H04W 72/042 20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04; H04W 48/16 20060101 H04W048/16; H04W 74/00 20060101
H04W074/00 |
Claims
1. A method for detecting downlink control information, the method
comprising: acquiring a pilot port determining parameter that
corresponds to downlink control information needing to be detected;
determining, according to the pilot port determining parameter, a
first-type pilot port that corresponds to the downlink control
information; and detecting the downlink control information
according to the first-type pilot port, wherein the pilot port
determining parameter is determined according to at least one of
the following: a format of the downlink control information, a
carrier index, configuration information of a second-type pilot,
resource configuration information of the downlink control
information, and a layer index of the downlink control
information.
2. The method according to claim 1, wherein: the format of the
downlink control information is one of at least one candidate
format of the downlink control information; and the carrier index
is an index of a carrier scheduled by using the downlink control
information.
3. The method according to claim 2, wherein the pilot port
determining parameter is determined according to the format of the
downlink control information, and the method further comprises:
determining a type of the downlink control information according to
the format of the downlink control information; and determining the
pilot port determining parameter according to the type of the
downlink control information, wherein at least two different types
of downlink control information correspond to different pilot port
determining parameters.
4. The method according to claim 3, wherein the type of the
downlink control information comprises: a type of uplink scheduling
control information and a type of downlink scheduling control
information; or a type of common control information and a type of
user specific control information.
5. The method according to claim 2, wherein the pilot port
determining parameter is determined according to the format of the
downlink control information, and the method further comprises:
acquiring a quantity of bits of the downlink control information
according to the format of the downlink control information; and
determining the pilot port determining parameter according to the
quantity of bits of the downlink control information.
6. The method according to claim 5, wherein: there are at least two
pieces of downlink control information needing to be detected; and
determining the pilot port determining parameter according to the
quantity of bits of the downlink control information comprises:
determining a size relationship between quantities of bits
comprised in the at least two pieces of downlink control
information, and determining the pilot port determining parameter
of the downlink control information according to the size
relationship, wherein: a port index determined by using a pilot
port determining parameter that corresponds to downlink control
information comprising a larger quantity of bits is greater than a
port index determined by using a pilot port determining parameter
that corresponds to downlink control information comprising a
smaller quantity of bits; or a port index determined by using a
pilot port determining parameter that corresponds to downlink
control information comprising a larger quantity of bits is less
than a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
comprising a smaller quantity of bits; or downlink control
information comprising a same quantity of bits corresponds to a
same pilot port determining parameter.
7. The method according to claim 1, wherein the configuration
information of the second-type pilot comprises any one or a
combination of the following: a quantity of ports for the
second-type pilot; power information of the second-type pilot; a
subframe offset at a moment when the second-type pilot is sent; and
a subframe period at the moment when the second-type pilot is
sent.
8. The method according to claim 1, wherein the second-type pilot
is a channel state information reference signal or a common pilot
signal.
9. The method according to claim 1, wherein determining, according
to the pilot port determining parameter, a first-type pilot port
that corresponds to the downlink control information comprises:
determining, according to a formula (1) or a formula (2), a port
index of the first-type pilot port that corresponds to the downlink
control information, wherein the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and the formula
(2) is: n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
n'.sub.0=n.sub.ECCE,low mod N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index the first-type pilot port, the
port index of the first-type pilot port has a correspondence with a
port number of the first-type pilot port, n.sub.ECCE,low is a
reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs comprised in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs comprised in the
EPDCCH.
10. A method for sending downlink control information, the method
comprising: acquiring a pilot port determining parameter that
corresponds to downlink control information; determining, according
to the pilot port determining parameter, a first-type pilot port
that corresponds to the downlink control information; and sending
the downlink control information according to the first-type pilot
port, wherein the pilot port determining parameter is determined
according to at least one of the following: a format of the
downlink control information, a carrier index, configuration
information of a second-type pilot, resource configuration
information of the downlink control information, and a layer index
of the downlink control information.
11. User equipment, comprising: a processor and a memory, wherein
the memory is configured to store execution instructions; and when
the user equipment runs, the processor communicates with the
memory, and the processor executes the execution instructions so
that the user equipment is configured to: acquire a pilot port
determining parameter that corresponds to downlink control
information needing to be detected, determine, according to the
pilot port determining parameter, a first-type pilot port that
corresponds to the downlink control information, and detect the
downlink control information according to the first-type pilot
port, wherein the pilot port determining parameter is determined
according to at least one of the following: a format of the
downlink control information, a carrier index, configuration
information of a second-type pilot, resource configuration
information of the downlink control information, and a layer index
of the downlink control information.
12. The user equipment according to claim 11, wherein: the format
of the downlink control information is one of at least one
candidate format of the downlink control information; and the
carrier index is an index of a carrier scheduled by using the
downlink control information.
13. The user equipment according to claim 12, wherein when the
processor executes the execution instructions the user equipment is
configured to: when the pilot port determining parameter is
determined according to the format of the downlink control
information, determine a type of the downlink control information
according to the format of the downlink control information; and
determine the pilot port determining parameter according to the
type of the downlink control information, wherein at least two
different types of downlink control information correspond to
different pilot port determining parameters.
14. The user equipment according to claim 13, wherein the type of
the downlink control information comprises: a type of uplink
scheduling control information and a type of downlink scheduling
control information; or a type of common control information and a
type of user specific control information.
15. The user equipment according to claim 12, wherein when the
processor executes the execution instructions the user equipment is
configured to: when the pilot port determining parameter is
determined according to the format of the downlink control
information, acquire a quantity of bits of the downlink control
information according to the format of the downlink control
information; and determine the pilot port determining parameter
according to the quantity of bits of the downlink control
information.
16. The user equipment according to claim 15, wherein when the
processor executes the execution instructions the user equipment is
configured to: when there are at least two pieces of downlink
control information needing to be detected, determine a size
relationship between quantities of bits comprised in the at least
two pieces of downlink control information; and determine the pilot
port determining parameter of the downlink control information
according to the size relationship, wherein: a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information comprising a larger
quantity of bits is greater than a port index determined by using a
pilot port determining parameter that corresponds to downlink
control information comprising a smaller quantity of bits, or a
port index determined by using a pilot port determining parameter
that corresponds to downlink control information comprising a
larger quantity of bits is less than a port index determined by
using a pilot port determining parameter that corresponds to
downlink control information comprising a smaller quantity of bits,
or downlink control information comprising a same quantity of bits
corresponds to a same pilot port determining parameter.
17. The user equipment according to claim 11, wherein the
configuration information of the second-type pilot comprises anyone
or a combination of the following: a quantity of ports for the
second-type pilot; power information of the second-type pilot; a
subframe offset at a moment when the second-type pilot is sent; and
a subframe period at the moment when the second-type pilot is
sent.
18. The user equipment according to claim 11, wherein the
second-type pilot is a channel state information reference signal
or a common pilot signal.
19. The user equipment according to claim 11, wherein when the
processor executes the execution instructions the user equipment is
further configured to: determine, according to a formula (1) or a
formula (2), a port index of the first-type pilot port that
corresponds to the downlink control information, wherein the
formula (1) is: n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and the formula
(2) is: n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
n'.sub.0=n.sub.ECCE,low mod N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs comprised in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs comprised in the
EPDCCH.
20. A base station, comprising: a processor and a memory, wherein
the memory is configured to store execution instructions; and when
the user equipment runs, the processor communicates with the
memory, and the processor executes the execution instruction so
that the user equipment is configured to: acquire a pilot port
determining parameter that corresponds to downlink control
information, determine, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information, and send the downlink control information
according to the first-type pilot port, wherein the pilot port
determining parameter is determined according to at least one of
the following: a format of the downlink control information, a
carrier index, configuration information of a second-type pilot,
resource configuration information of the downlink control
information, and a layer index of the downlink control information.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2013/077396, filed on Jun. 18, 2013, which is
hereby incorporated by reference in its entirety.
TECHNICAL FIELD
[0002] Embodiments of the present invention relate to
communications technologies, and in particular, to methods for
detecting and sending downlink control information and devices.
BACKGROUND
[0003] A multi-user multiple-input multiple-output (Multiple Input
Multiple Output, MIMO for short) technology can suppress channel
fading, so that a capacity, a coverage range, and spectrum
utilization of a channel can be improved greatly.
[0004] A MIMO system improves the spectrum utilization by using
spatial multiplexing. For example, at a transmit end, for a
high-speed data stream, the high-speed data stream is made into
several data substreams according to series/parallel change of a
quantity of transmit antennas, then the data substreams are encoded
separately, and the data substreams are transmitted by using
enhanced control channel elements. One data substream corresponds
to at least one enhanced control channel element, which is used to
transmit the data substreams to form multi-layer transmission in
space, where a quadrature modulation manner is used between layers
to avoid co-channel interference, and then the data substreams are
transmitted by using a transmit antenna. At a receive end, blind
detection is performed based on a pilot port.
[0005] However, in the prior art, data streams of various layers in
multi-layer transmission use a same pilot port, channel estimation
cannot be correctly performed when data of multiple layers
corresponds to a same port, causing that user equipment cannot
correctly perform blind detection on downlink control
information.
SUMMARY
[0006] Embodiments of the present invention provide methods for
detecting and sending downlink control information and devices,
which are used to make user equipment correctly detect downlink
control information.
[0007] According to a first aspect, an embodiment of the present
invention provides a method for detecting downlink control
information, including:
[0008] acquiring a pilot port determining parameter that
corresponds to downlink control information needing to be
detected;
[0009] determining, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information; and
[0010] detecting the downlink control information according to the
first-type pilot port, where
[0011] the pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0012] With reference to the first aspect, in a first possible
implementation manner of the first aspect, the format of the
downlink control information is one of at least one candidate
format of the downlink control information; and
[0013] the carrier index is an index of a carrier scheduled by
using the downlink control information.
[0014] With reference to the first aspect or the first possible
implementation manner of the first aspect, in a second possible
implementation manner of the first aspect, the pilot port
determining parameter is determined according to the format of the
downlink control information, and the method includes:
[0015] determining a type of the downlink control information
according to the format of the downlink control information;
and
[0016] determining the pilot port determining parameter according
to the type of the downlink control information, where
[0017] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0018] With reference to the second possible implementation manner
of the first aspect, in a third possible implementation manner of
the first aspect, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0019] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0020] With reference to the first aspect or the first possible
implementation manner of the first aspect, in a fourth possible
implementation manner of the first aspect, the pilot port
determining parameter is determined according to the format of the
downlink control information, and the method includes:
[0021] acquiring a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0022] determining the pilot port determining parameter according
to the quantity of bits of the downlink control information.
[0023] With reference to the fourth possible implementation manner
of the first aspect, in a fifth possible implementation manner of
the first aspect, there are at least two pieces of downlink control
information needing to be detected, and the determining the pilot
port determining parameter according to the quantity of bits of the
downlink control information includes:
[0024] determining a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0025] determining the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0026] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0027] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0028] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0029] With reference to the first aspect or any one of the first
to the fifth possible implementation manners of the first aspect,
in a sixth possible implementation manner of the first aspect, the
carrier index includes at least one of the following:
[0030] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0031] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0032] With reference to the first aspect or the first to the sixth
possible implementation manners of the first aspect, in a seventh
possible implementation manner of the first aspect, the
configuration information of the second-type pilot includes any one
or a combination of the following:
[0033] a quantity of ports for the second-type pilot;
[0034] power information of the second-type pilot;
[0035] a subframe offset at a moment when the second-type pilot is
sent; and
[0036] a subframe period at the moment when the second-type pilot
is sent.
[0037] With reference to the first aspect or the first to the
seventh possible implementation manners of the first aspect, in an
eighth possible implementation manner of the first aspect, the
second-type pilot is a channel state information reference signal
or a common pilot signal.
[0038] With reference to the first aspect or the first to the
eighth possible implementation manners of the first aspect, in a
ninth possible implementation manner of the first aspect, the
resource configuration information of the downlink control
information includes any one or a combination of the following:
[0039] a size of a time-frequency resource of the downlink control
information;
[0040] a time domain position of a resource of the downlink control
information;
[0041] a frequency domain position of the resource of the downlink
control information; and
[0042] precoding information used by the downlink control
information.
[0043] With reference to the first aspect or the first to the ninth
possible implementation manners of the first aspect, in a tenth
possible implementation manner of the first aspect, the
determining, according to the pilot port determining parameter, a
first-type pilot port that corresponds to the downlink control
information includes:
[0044] determining, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0045] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0046] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0047] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0048] According to a second aspect, an embodiment of the present
invention provides a method for sending downlink control
information, including:
[0049] acquiring a pilot port determining parameter that
corresponds to downlink control information;
[0050] determining, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information; and
[0051] sending the downlink control information according to the
first-type pilot port, where
[0052] the pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0053] With reference to the second aspect, in a first possible
implementation manner of the second aspect, the format of the
downlink control information is one of at least one candidate
format of the downlink control information; and
[0054] the carrier index is an index of a carrier scheduled by
using the downlink control information.
[0055] With reference to the second aspect or the first possible
implementation manner of the second aspect, in a second possible
implementation manner of the second aspect, the pilot port
determining parameter is determined according to the format of the
downlink control information, and the method includes:
[0056] determining a type of the downlink control information
according to the format of the downlink control information;
and
[0057] deteimining the pilot port determining parameter according
to the type of the downlink control information, where
[0058] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0059] With reference to the second possible implementation manner
of the second aspect, in a third possible implementation manner of
the second aspect, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0060] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0061] With reference to the second aspect or the first possible
implementation manner of the second aspect, in a fourth possible
implementation manner of the second aspect, the pilot port
determining parameter is determined according to the format of the
downlink control information, and the method includes:
[0062] acquiring a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0063] determining the pilot port determining parameter according
to the quantity of bits of the downlink control information.
[0064] With reference to the fourth possible implementation manner
of the second aspect, in a fifth possible implementation manner of
the second aspect, there are at least two pieces of downlink
control information needing to be detected, and the determining the
pilot port determining parameter according to the quantity of bits
of the downlink control information includes:
[0065] determining a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0066] determining the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0067] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0068] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0069] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0070] With reference to the second aspect or the first to the
fifth possible implementation manners of the second aspect, in a
sixth possible implementation manner of the second aspect, the
carrier index includes at least one of the following:
[0071] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0072] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0073] With reference to the second aspect or the first to the
sixth possible implementation manners of the second aspect, in a
seventh possible implementation manner of the second aspect, the
configuration information of the second-type pilot includes any one
or a combination of the following:
[0074] a quantity of ports for the second-type pilot;
[0075] power information of the second-type pilot;
[0076] a subframe offset at a moment when the second-type pilot is
sent; and
[0077] a subframe period at the moment when the second-type pilot
is sent.
[0078] With reference to the second aspect or the first to the
seventh possible implementation manners of the second aspect, in an
eighth possible implementation manner of the second aspect, the
second-type pilot is a channel state information reference signal
or a common pilot signal.
[0079] With reference to the second aspect or the first to the
eighth possible implementation manners of the second aspect, in a
ninth possible implementation manner of the second aspect, the
resource configuration information of the downlink control
information includes any one or a combination of the following:
[0080] a size of a time-frequency resource of the downlink control
information;
[0081] a time domain position of a resource of the downlink control
information;
[0082] a frequency domain position of the resource of the downlink
control information; and
[0083] precoding information used by the downlink control
information.
[0084] With reference to the second aspect or the first to the
ninth possible implementation manners of the second aspect, in a
tenth possible implementation manner of the second aspect, the
determining, according to the pilot port determining parameter, a
first-type pilot port that corresponds to the downlink control
information includes:
[0085] determining, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0086] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0087] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0088] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0089] According to a third aspect, an embodiment of the present
invention provides user equipment, including:
[0090] an acquiring module, configured to acquire a pilot port
determining parameter that corresponds to downlink control
information needing to be detected;
[0091] a port determining module, configured to determine,
according to the pilot port determining parameter, a first-type
pilot port that corresponds to the downlink control information;
and
[0092] a detecting module, configured to detect the downlink
control information according to the first-type pilot port,
where
[0093] the pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0094] With reference to the third aspect, in a first possible
implementation manner of the third aspect, the format of the
downlink control information is one of at least one candidate
format of the downlink control information; and
[0095] the carrier index is an index of a carrier scheduled by
using the downlink control information.
[0096] With reference to the third aspect or the first possible
implementation manner of the third aspect, in a second possible
implementation manner of the third aspect, the user equipment
further includes: a first parameter determining module, configured
to: when the pilot port determining parameter is determined
according to the format of the downlink control information,
[0097] determine a type of the downlink control information
according to the format of the downlink control information;
and
[0098] determine the pilot port determining parameter according to
the type of the downlink control information, where
[0099] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0100] With reference to the second possible implementation manner
of the third aspect, in a third possible implementation manner of
the third aspect, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0101] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0102] With reference to the third aspect or the first possible
implementation manner of the third aspect, in a fourth possible
implementation manner of the third aspect, the user equipment
further includes: a second parameter determining module, configured
to: when the pilot port determining parameter is determined
according to the format of the downlink control information,
[0103] acquire a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0104] determine the pilot port determining parameter according to
the quantity of bits of the downlink control information.
[0105] With reference to the fourth possible implementation manner
of the third aspect, in a fifth possible implementation manner of
the third aspect, the second parameter determining module is
further specifically configured to: when there are at least two
pieces of downlink control information needing to be detected,
[0106] determine a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0107] determine the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0108] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0109] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0110] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0111] With reference to the third aspect or the first to the fifth
possible implementation manners of the third aspect, in a sixth
possible implementation manner of the third aspect, the carrier
index includes at least one of the following:
[0112] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0113] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0114] With reference to the third aspect or the first to the sixth
possible implementation manners of the third aspect, in a seventh
possible implementation manner of the third aspect, the
configuration information of the second-type pilot includes any one
or a combination of the following:
[0115] a quantity of ports for the second-type pilot;
[0116] power information of the second-type pilot;
[0117] a subframe offset at a moment when the second-type pilot is
sent; and
[0118] a subframe period at the moment when the second-type pilot
is sent.
[0119] With reference to the third aspect or the first to the
seventh possible implementation manners of the third aspect, in an
eighth possible implementation manner of the third aspect, the
second-type pilot is a channel state information reference signal
or a common pilot signal.
[0120] With reference to the third aspect or the first to the
eighth possible implementation manners of the third aspect, in a
ninth possible implementation manner of the third aspect, the
resource configuration information of the downlink control
information includes any one or a combination of the following:
[0121] a size of a time-frequency resource of the downlink control
information;
[0122] a time domain position of a resource of the downlink control
information;
[0123] a frequency domain position of the resource of the downlink
control information; and
[0124] precoding information used by the downlink control
information.
[0125] With reference to the third aspect or the first to the ninth
possible implementation manners of the third aspect, in a tenth
possible implementation manner of the third aspect, the port
determining module is specifically configured to:
[0126] determine, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0127] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0128] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0129] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0130] According to a fourth aspect, an embodiment of the present
invention provides a base station, including:
[0131] an acquiring module, configured to acquire a pilot port
determining parameter that corresponds to downlink control
information;
[0132] a port determining module, configured to determine,
according to the pilot port determining parameter, a first-type
pilot port that corresponds to the downlink control information;
and
[0133] a sending module, configured to send the downlink control
information according to the first-type pilot port, where
[0134] the pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0135] With reference to the fourth aspect, in a first possible
implementation manner of the fourth aspect, the format of the
downlink control information is one of at least one candidate
format of the downlink control information; and
[0136] the carrier index is an index of a carrier scheduled by
using the downlink control information.
[0137] With reference to the fourth aspect or the first possible
implementation manner of the fourth aspect, in a second possible
implementation manner of the fourth aspect, the base station
further includes: a first parameter determining module, configured
to: when the pilot port determining parameter is determined
according to the format of the downlink control information,
[0138] determine a type of the downlink control information
according to the format of the downlink control information;
and
[0139] determine the pilot port determining parameter according to
the type of the downlink control information, where
[0140] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0141] With reference to the second possible implementation manner
of the fourth aspect, in a third possible implementation manner of
the fourth aspect, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0142] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0143] With reference to the fourth aspect or the first possible
implementation manner of the fourth aspect, in a fourth possible
implementation manner of the fourth aspect, the base station
further includes: a second parameter determining module, configured
to: when the pilot port determining parameter is determined
according to the format of the downlink control information,
[0144] acquire a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0145] determine the pilot port determining parameter according to
the quantity of bits of the downlink control information.
[0146] With reference to the fourth possible implementation manner
of the fourth aspect, in a fifth possible implementation manner of
the fourth aspect, the second parameter determining module is
further specifically configured to: when there are at least two
pieces of downlink control information needing to be detected,
[0147] determine a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0148] determine the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0149] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0150] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0151] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0152] With reference to the fourth aspect or the first to the
fifth possible implementation manners of the fourth aspect, in a
sixth possible implementation manner of the fourth aspect, the
carrier index includes at least one of the following:
[0153] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0154] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0155] With reference to the fourth aspect or the first to the
sixth possible implementation manners of the fourth aspect, in a
seventh possible implementation manner of the fourth aspect, the
configuration information of the second-type pilot includes any one
or a combination of the following:
[0156] a quantity of ports for the second-type pilot;
[0157] power information of the second-type pilot;
[0158] a subframe offset at a moment when the second-type pilot is
sent; and
[0159] a subframe period at the moment when the second-type pilot
is sent.
[0160] With reference to the fourth aspect or the first to the
seventh possible implementation manners of the fourth aspect, in an
eighth possible implementation manner of the fourth aspect, the
second-type pilot is a channel state information reference signal
or a common pilot signal.
[0161] With reference to the fourth aspect or the first to the
eighth possible implementation manners of the fourth aspect, in a
ninth possible implementation manner of the fourth aspect, the
resource configuration information of the downlink control
information includes any one or a combination of the following:
[0162] a size of a time-frequency resource of the downlink control
information;
[0163] a time domain position of a resource of the downlink control
information;
[0164] a frequency domain position of the resource of the downlink
control information; and
[0165] precoding information used by the downlink control
information.
[0166] With reference to the fourth aspect or the first to the
ninth possible implementation manners of the fourth aspect, in a
tenth possible implementation manner of the fourth aspect, the port
determining module is specifically configured to:
[0167] determine, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0168] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0169] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0170] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0171] According to a fifth aspect, an embodiment of the present
invention provides user equipment, including a processor and a
memory, where the memory stores an execution instruction; and when
the user equipment runs, the processor communicates with the
memory, and the processor executes the execution instruction so
that the user equipment performs the method according to the first
aspect or any one of the first to the tenth possible implementation
manners of the first aspect.
[0172] According to a sixth aspect, an embodiment of the present
invention provides a base station, including a processor and a
memory, where the memory stores an execution instruction; and when
the base station runs, the processor communicates with the memory,
and the processor executes the execution instruction to so that the
base station performs the method according to the second aspect or
any one of the first to the tenth possible implementation manners
of the second aspect.
[0173] According to the methods for detecting and sending downlink
control information and the devices provided in the embodiments of
the present invention, in the method for detecting downlink control
information, a pilot port determining parameter that corresponds to
downlink control information needing to be detected is acquired,
and a first-type pilot port that corresponds to the downlink
control information is determined according to the pilot port
determining parameter, that is, user equipment can determine
different first-type pilot ports that correspond to multiple pieces
of DCI transmitted on a time-frequency resource, and correctly
detect the downlink control information according to the first-type
pilot ports. Transmission is performed by using different ports, so
that multiple pieces of DCI can be spatially multiplexed, thereby
improving transmission efficiency.
BRIEF DESCRIPTION OF DRAWINGS
[0174] To describe the technical solutions in the embodiments of
the present invention or in the prior art more clearly, the
following briefly introduces the accompanying drawings required for
describing the embodiments. Apparently, the accompanying drawings
in the following description show merely some embodiments of the
present invention, and persons of ordinary skill in the art may
still derive other drawings from these accompanying drawings
without creative efforts.
[0175] FIG. 1 is a schematic flowchart of Embodiment 1 of a method
for detecting downlink control information according to the present
invention;
[0176] FIG. 2 is a schematic diagram showing that CCEs form PDCCHs
of different user equipments according to an embodiment of the
present invention;
[0177] FIG. 3A is a schematic diagram 1 of pilot ports that
correspond to ECCEs according to an embodiment of the present
invention;
[0178] FIG. 3B is a schematic diagram 2 of pilot ports that
correspond to ECCEs according to an embodiment of the present
invention;
[0179] FIG. 4 is a schematic diagram showing that a base station
transmits at multiple layers downlink control information of same
user equipment according to an embodiment of the present
invention;
[0180] FIG. 5 is a schematic flowchart of Embodiment 1 of a method
for sending downlink control information according to the present
invention;
[0181] FIG. 6 is a schematic diagram of cross-carrier scheduling
according to an embodiment of the present invention;
[0182] FIG. 7 is a schematic structural diagram of Embodiment 1 of
user equipment according to an embodiment of the present
invention;
[0183] FIG. 8 is a schematic structural diagram of Embodiment 2 of
user equipment according to an embodiment of the present
invention;
[0184] FIG. 9 is a schematic structural diagram of Embodiment 1 of
a base station according to an embodiment of the present
invention;
[0185] FIG. 10 is a schematic structural diagram of Embodiment 2 of
a base station according to an embodiment of the present
invention;
[0186] FIG. 11 is a schematic structural diagram of Embodiment 3 of
user equipment according to an embodiment of the present invention;
and
[0187] FIG. 12 is a schematic structural diagram of Embodiment 3 of
a base station according to an embodiment of the present
invention.
DETAILED DESCRIPTION
[0188] The following clearly describes the technical solutions in
the embodiments of the present invention with reference to the
accompanying drawings in the embodiments of the present invention.
Apparently, the described embodiments are merely some but not all
of the embodiments of the present invention. All other embodiments
obtained by persons of ordinary skill in the art based on the
embodiments of the present invention without creative efforts shall
fall within the protection scope of the present invention.
[0189] FIG. 1 is a schematic flowchart of Embodiment 1 of a method
for detecting downlink control information according to the present
invention. This embodiment is performed by user equipment, and the
user equipment may be implemented by using software and/or
hardware. As shown in FIG. 1, the method in this embodiment may
include:
[0190] Step 101: Acquire a pilot port determining parameter that
corresponds to downlink control information needing to be
detected.
[0191] Step 102: Determine, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information.
[0192] Step 103: Detect the downlink control information according
to the first-type pilot port.
[0193] In a Long Term Evolution (Long Term Evolution, LTE for
short) system, a control channel element (Control Channel Element,
CCE for short) serves as a component unit of a physical downlink
control channel (Physical Downlink Control Channel, PDCCH for
short), and each CCE is mapped onto a group of specific resource
elements (Resource Element, RE for short) within a PDCCH area. The
PDCCH may include one, two, four or eight CCEs, respectively
corresponding to different encoding rates. Downlink control
information is carried on the PDCCH.
[0194] Abase station determines, according to a channel condition
of the user equipment, how many and which CCEs form a PDCCH for
transmitting downlink control information (Downlink Control
Information, DCI for short) of the user equipment. FIG. 2 is a
schematic diagram showing that CCEs form PDCCHs of different user
equipments according to this embodiment of the present invention.
As shown in FIG. 2, CCE0 to CCE3 form a PDCCH of UE1, CCE4 and CCE5
form a PDCCH of UE2, CCE6 and CCE7 form a PDCCH of UE3, CCE8 forms
a PDCCH of UE4, CCE9 forms a PDCCH of UE5, and CCE10 forms a PDCCH
of UE6. A control channel element of an enhanced physical downlink
control channel (Enhanced Physical Downlink Control channel, EPDCCH
for short) is an enhanced control channel element (Enhanced Control
Channel Element, ECCE for short), and in a transmission process, an
ECCE uses a port that corresponds to the ECCE for transmission. For
example, FIG. 3A is a schematic diagram 1 of pilot ports that
correspond to ECCEs according to this embodiment of the present
invention. As shown in FIG. 3A, when an aggregation level is 2,
that is, when the EPDCCH is formed by aggregating two ECCEs, every
two ECCEs correspond to one pilot port, where the pilot port refers
to an antenna port (Antenna port, AP for short) used by a pilot. In
this embodiment, for ease of description, ports such as AP107 and
AP108 are directly referred to as a pilot port AP107, a pilot port
108, and the like. As shown in FIG. 3A, ECCE0 and ECCE1 correspond
to the pilot port AP107 or AP108, and ECCE2 and ECCE3 correspond to
a pilot port AP109 or AP110. FIG. 3B is a schematic diagram 2 of
pilot ports that correspond to ECCEs according to this embodiment
of the present invention. As shown in FIG. 3B, when an aggregation
level is 4, that is, when the EPDCCH is formed by aggregating four
ECCEs, every four ECCEs correspond to one pilot port, that is,
ECCE0, ECCE1, ECCE2 and ECCE3 correspond to any one of pilot ports
AP107, AP108, AP109 and AP110, other cases are similar, and details
are not described herein again.
[0195] Before receiving or sending service data, the user equipment
needs to learn DCI that is sent by the base station to the user
equipment. However, before receiving the DCI, the user equipment
does not clearly know on which EPDCCH candidate the DCI is carried;
therefore, the user equipment needs to perform blind detection on
possible EPDCCH candidates until an EPDCCH of the user equipment is
detected. One EPDCCH candidate includes at least one ECCE.
[0196] In a specific implementation process, when the base station
uses multi-layer transmission, the base station may transmit
multiple pieces of DCI of a same user on time-frequency resources
that correspond to a same ECCE. Specifically, as shown in FIG. 4,
FIG. 4 is a schematic diagram showing that a base station transmits
at multiple layers downlink control information of same user
equipment according to an embodiment of the present invention. As
shown in FIG. 4, ECCE0 and ECCE1 have two layers, and the base
station transmits at multiple layers DCI0 and DCI1 of same UE.
[0197] In a specific implementation process, the base station and
the user equipment determine a first-type pilot port by using a
same method, where the base station sends downlink control
information according to the first-type pilot port, and the user
equipment detects the downlink control information according to the
first-type pilot port. The user equipment determines, according to
the method for detecting downlink control info/nation provided in
this embodiment, a specific correspondence between an ECCE and a
first-type pilot port, and performs blink detection on downlink
control information according to a specific first-type pilot
port.
[0198] In step 101, the user equipment acquires the pilot port
determining parameter that corresponds to the downlink control
information needing to be detected, where the pilot port
determining parameter is determined according to at least one of
the following: a format of the downlink control information, a
carrier index, configuration information of a second-type pilot,
resource configuration information of the downlink control
information, and a layer index of the downlink control
information.
[0199] The format of the downlink control information is one of at
least one candidate format of the downlink control information, and
the at least one candidate format of the downlink control
information includes: a DCI format 0, a DCI format 1, a DCI format
1A, a DCI format 2, a DCI format 3, a DCI format 3A, and the like.
Different control information is transmitted in different formats.
For example, uplink scheduling control information is transmitted
in the DCI format 0, and downlink scheduling control information is
transmitted in the DCI format 1. Different formats of the downlink
control information correspond to different pilot port determining
parameters, for example, for the DCI format 0, a corresponding
pilot port determining parameter is 1, for the DCI format 1, a
corresponding pilot port determining parameter is 2, and details
are not described herein again in this embodiment.
[0200] The carrier index is an index of a carrier scheduled by
using the downlink control information. In a scenario of carrier
aggregation, there are at least two carriers, and each carrier has
a number, that is, the carrier index. Different carrier indexes
correspond to different pilot port determining parameters. For
example, when control signaling of a local carrier schedules data
of the local carrier, during detecting of a control channel of the
local carrier, a pilot port determining parameter is obtained
according to a carrier index of the local carrier, and further a
pilot port that corresponds to the local carrier is determined, to
detect the control channel. When cross-carrier scheduling is used,
and when the local carrier detects and schedules a control channel
of data of another carrier, a pilot port determining parameter
needs to be obtained by using a carrier index of the another
carrier, and further a pilot port that corresponds to the another
carrier is determined, to detect the control channel.
[0201] A type of the second-type pilot is different from that of a
first-type pilot, the first-type pilot may be a demodulation
reference signal (Demodulation Reference Signal, DMRS for short),
and the second-type pilot is specifically a channel state
information reference signal (Channel State Information Reference
signal, CSI-RS for short), or a common reference signal (Common
Reference signal, CRS for short). The CSI-RS is a measurement
pilot, and the common reference signal is a common pilot. The UE
measures and feeds back channel quality information according to
the CSI-RS, and the UE demodulates data or measures and feeds back
channel quality information based on the CRS. When multiple
transmission nodes simultaneously transmit control channels on a
same time-frequency resource, that is, multiple control channels
are spatially multiplexed, channel estimation can be performed on
the control channels only when pilot ports of the control channels
are different. Because different transmission nodes correspond to
different CSI-RS configuration information, a correspondence
between the CSI-RS configuration information and the first-type
pilot may be set. In this way, a determining parameter of the
first-type pilot port is obtained by using the CSI-RS configuration
information of different transmission nodes, and further a
corresponding pilot port is determined, to detect a control
channel.
[0202] The resource configuration information of the downlink
control information includes any one or a combination of the
following: a size of a time-frequency resource of the downlink
control information; a time domain position of a resource of the
downlink control information; a frequency domain position of the
resource of the downlink control information; and precoding
information used by the downlink control information.
[0203] When sizes of configured time-frequency resources of
downlink control channels are different, different pilot port
deteimining parameters are used. A quantity of pilot ports used
when the time-frequency resource of the downlink control channels
is less than a specific threshold is greater than a quantity of
pilot ports used when the time-frequency resource of the downlink
control channel is greater than the specific threshold, for
example, when the time-frequency resource of the downlink control
channel is less than the specific threshold, four pilot ports, that
is, pilot ports AP107, AP108, AP109 and AP110 are used for
transmission; when the time-frequency resource of the downlink
control channels is greater than the specific threshold, two pilot
ports, that is, pilot ports AP107 and AP109 are used for
transmission.
[0204] When configured time-frequency resource positions of
downlink control channels are different, different pilot port
determining parameters are used. When the time-frequency resource
of the downlink control channel is at a central position in a
frequency domain, four pilot ports, that is, pilot ports AP107,
AP108, AP109 and AP110 are used for transmission.
[0205] When precoding matrices used by downlink control channels
are different, different pilot port determining parameters are
used. When the time-frequency resource of the downlink control
channels is a collection C1, two pilot ports, that is, pilot ports
AP107 and AP109 are used for transmission; when the time-frequency
resource of the downlink control channels is a collection C2, two
pilot ports, that is, pilot ports AP108 and AP110 are used for
transmission.
[0206] When same downlink control information is transmitted by
using multiple layers, different ports may be used for transmission
at different layers. Specifically, the layer index of the downlink
control information may have a correspondence with a port number,
and different layer indexes correspond to different port numbers.
For example, the downlink control information is transmitted by
using two layers, and pilot ports that correspond to layer indexes
0 and 2 are the pilot port AP107 and the pilot port AP109
respectively. Transmitting the downlink control information by
using three layers or four layers is similar to transmitting by
using two layers, and details are not described herein again in
this embodiment.
[0207] In a specific process of determining the pilot port
determining parameter, when the user equipment receives multiple
pieces of downlink control information on a same ECCE, the pilot
port determining parameter may be determined according to any one
of: the format of the downlink control information, the carrier
index, the configuration information of the second-type pilot, the
resource configuration information of the downlink control
information, and the layer index of the downlink control
information, and the pilot port determining parameter may also be
determined by comprehensively considering a plural of the above.
The pilot port determining parameter is an integer. It may be
understood by persons skilled in the art that when there are
multiple pieces of downlink control information received by the
user equipment on a same ECCE, there are also multiple
corresponding pilot port determining parameters with different
values.
[0208] In an implementation manner of this embodiment, for example,
the user equipment can determine the pilot port determining
parameter according to the format of the downlink control
information, the carrier index, and the like.
[0209] For example, for a control channel that needs to be
detected, if a carrier index corresponding to the control channel
is CC2, a pilot port determining parameter corresponding to the
control channel is .DELTA.1, the control channel transmits downlink
scheduling control information, and a pilot port determining
parameter corresponding to the downlink scheduling control
information is .DELTA.2; then the pilot port determining parameter
is a function of .DELTA.1 and .DELTA.2, that is, .DELTA.1+.DELTA.2
or .DELTA.1*.DELTA.2.
[0210] It may be understood by persons skilled in the art that, in
a specific implementation process, the user equipment can determine
the pilot port determining parameter according to any one of: the
format of the downlink control information, the carrier index, the
configuration information of the second-type pilot, the resource
configuration information of the downlink control information, and
the layer index of the downlink control information; when the user
equipment determines the pilot port determining parameter according
to a combination of the format of the downlink control information,
the carrier index, and the configuration information of the
second-type pilot, respective pilot port determining parameters may
be separately obtained first, and then the pilot port determining
parameters are added up to acquire a final pilot port determining
parameter.
[0211] In step 102, the user equipment determines, according to the
pilot port determining parameter, the first-type pilot port that
corresponds to the downlink control information. The user equipment
may calculate each pilot port determining parameter, to acquire a
port index of the first-type pilot port, where the port index of
the first-type pilot port has a correspondence with a port number
of the first-type pilot port, and the port number of the first-type
pilot port may be learned according to the correspondence.
[0212] In step 103, the user equipment performs blind detection on
the downlink control information according to the first-type pilot
port.
[0213] In a specific implementation process, the user equipment
determines a first-type pilot port that corresponds to the downlink
control information, performs channel estimation according to the
corresponding first-type pilot port to obtain a channel
coefficient, and demodulates and decodes the control channel, and
further blind detection is performed on each physical downlink
control channel candidate in a search region.
[0214] According to the method for detecting downlink control
information provided in this embodiment of the present invention, a
pilot port determining parameter that corresponds to downlink
control information needing to be detected is acquired, a
first-type pilot port that corresponds to the downlink control
information is determined according to the pilot port determining
parameter, that is, user equipment can determine different
first-type pilot ports that correspond to multiple pieces of DCI
transmitted on a time-frequency resource, and correctly detect the
downlink control information according to the first-type pilot
ports. Transmission is performed by using different ports, so that
multiple pieces of DCI can be spatially multiplexed, thereby
improving transmission efficiency.
[0215] FIG. 5 is a schematic flowchart of Embodiment 1 of a method
for sending downlink control information according to the present
invention. This embodiment is performed by a base station, and the
base station may be implemented by using software and/or hardware.
As shown in FIG. 5, the method in this embodiment may include:
[0216] Step 501: Acquire a pilot port determining parameter that
corresponds to downlink control information.
[0217] Step 502: Determine, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information.
[0218] Step 503: Send the downlink control information according to
the first-type pilot port.
[0219] The pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0220] An application scenario of the method for sending downlink
control information provided in this embodiment is similar to the
application scenario of the embodiment shown in FIG. 1 to FIG. 3,
and details are not described herein again in this embodiment.
[0221] In this embodiment, the base station and user equipment
determine a first-type pilot port by using a same method, that is,
step 501 and step 502 are similar to step 101 and step 102, and
details are not described herein again in this embodiment.
[0222] In step 503, the base station selects one control channel
from candidate physical downlink control channels, and sends the
downlink control information to the user equipment by using the
selected control channel and a first-type pilot port that
corresponds to the control channel, so that the UE can receive
downlink data or send uplink data according to the downlink control
information.
[0223] According to the method for sending downlink control
information provided in this embodiment of the present invention, a
base station acquires a pilot port determining parameter that
corresponds to downlink control information, determines, according
to the pilot port determining parameter, a first-type pilot port
that corresponds to the downlink control information, and sends the
downlink control information according to the first-type pilot
port, so that user equipment correctly detect the downlink control
information.
[0224] In this embodiment, based on the embodiments of FIG. 1 and
FIG. 5, a specific method determining the pilot port determining
parameter by the user equipment and the base station is described
in detail, and a manner of determining the pilot port determining
parameter includes the following feasible implementation
manners.
[0225] In a feasible implementation manner, the pilot port
determining parameter is determined according to the format of the
downlink control information. Specifically, there are two cases for
determining the pilot port determining parameter according to the
format of the downlink control information.
[0226] Case 1: A type of the downlink control information is
determined according to the format of the downlink control
information; and the pilot port determining parameter is determined
according to the type of the downlink control information.
[0227] At least two different types of downlink control information
correspond to different pilot port determining parameters.
[0228] In a specific implementation process, according to different
classification principles, in this embodiment, the type of the
downlink control information is classified into a type of uplink
scheduling control information and a type of downlink scheduling
control information. The uplink scheduling control information is
control information for performing uplink scheduling by the user
equipment, and the downlink scheduling control information is
control information for performing downlink scheduling by the user
equipment.
[0229] Alternatively, the type of the downlink control information
is classified into a type of common control information and a type
of user specific control information.
[0230] Specifically, in this embodiment, different types of
downlink control information correspond to different pilot port
determining parameters. For example, a pilot port determining
parameter that corresponds to the uplink scheduling control
information is 1, and a pilot port determining parameter that
corresponds to the downlink scheduling control information is 2.
For the common control information and the user specific control
information, cases are similar thereto and details are not
described herein again in this embodiment.
[0231] Case 2: A quantity of bits of the downlink control
information is acquired according to the format of the downlink
control information; and the pilot port determining parameter is
determined according to the quantity of bits of the downlink
control information.
[0232] In a specific implementation process, if there are at least
two pieces of downlink control information needing to be detected,
a size relationship between quantities of bits included in the at
least two pieces of downlink control information is determined; and
the pilot port determining parameter of the downlink control
information is determined according to the size relationship, where
a port index determined by using a pilot port determining parameter
that corresponds to downlink control information including a larger
quantity of bits is greater than a port index determined by using a
pilot port determining parameter that corresponds to downlink
control information including a smaller quantity of bits; or a port
index determined by using a pilot port determining parameter that
corresponds to downlink control information including a larger
quantity of bits is less than a port index determined by using a
pilot port determining parameter that corresponds to downlink
control information including a smaller quantity of bits; or
downlink control information including a same quantity of bits
corresponds to a same pilot port determining parameter.
[0233] In another feasible implementation manner, the pilot port
determining parameter is determined by using the carrier index,
where the carrier index includes: a carrier index of a first
carrier on which the downlink control information needing to be
detected is located; or, a carrier index of a second carrier
scheduled, during cross-carrier scheduling, by the downlink control
information that is on the first carrier. Specifically, it may be
shown in FIG. 6.
[0234] FIG. 6 is a schematic diagram of cross-carrier scheduling
according to an embodiment of the present invention. As shown in
FIG. 6, an EPDCCH channel mainly carries DCI of a physical downlink
shared channel (Physical Downlink Shared Channel, PDSCH for short).
When cross-carrier scheduling is used, uplink-transmission downlink
control information or downlink-transmission downlink control
information on a first carrier CC0 and/or a second carrier CC1 and
a second carrier CC2 is scheduled on the first carrier (carrier)
CC0, then CC0 needs to transmit DCI0 (which corresponds to an
enhanced physical downlink control channel EPDCCH0) of CC0, DCI1
(which corresponds to an enhanced physical downlink control channel
EPDCCH1) of CC1, and DCI2 (which corresponds to an enhanced
physical downlink control channel EPDCCH2) on CC2. DCI0, DCI1 and
DCI2 may be transmitted on a same CCE by using a manner of spatial
multiplexing, but first-type pilot ports need to be distinguished.
The pilot port determining parameter may be determined according to
the index of the first carrier on which the downlink control
information is located and the carrier index of the second carrier
scheduled, during cross-carrier scheduling, by the downlink control
information that is on the first carrier. For example, a value of
the carrier index of the first carrier is 1, and then a value of
the pilot port determining parameter may be 1; a value of the
carrier index of the second carrier is 2, and then a value of the
pilot port determining parameter may be 2; and the like.
[0235] In still another feasible implementation manner, the pilot
port determining parameter is determined by using the configuration
information of the second-type pilot. The configuration information
of the second-type pilot includes any one or a combination of the
following:
[0236] a quantity of ports for the second-type pilot;
[0237] power information of the second-type pilot;
[0238] a subframe offset at a moment when the second-type pilot is
sent; and
[0239] a subframe period at the moment when the second-type pilot
is sent.
[0240] In a specific implementation process, the pilot port
determining parameter may be determined according to the quantity
of ports for the second-type pilot, power, and a subframe offset
and a subframe period of sending.
[0241] In this embodiment, the pilot port determining parameter is
determined according to any one or a combination of the following:
the format of the downlink control information, the carrier index,
and the configuration information of the second-type pilot, so
that, in various application scenarios, when the base station
transmits multiple pieces of DCI of a same user on a time-frequency
resource of a same CCE, the user equipment can determine a port
determining parameter that corresponds to the pieces of DCI.
[0242] In this embodiment, based on the foregoing embodiments, that
the user equipment and the base station determine, according to the
pilot port determining parameter, the first-type pilot port that
corresponds to the downlink control information is described in
detail.
[0243] In a specific implementation process, the base station or
the user equipment determines, according to a formula (1) or a
formula (2), a port index of the first-type pilot port that
corresponds to the downlink control information, where
[0244] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0245] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0246] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which a enhanced physical control channel EPDCCH is located,
N.sub.RB.sup.ECCE is a quantity of ECCEs included in each physical
resource block, n.sub.RNTI is a value of a radio network temporary
identity (Radio Network Temporary Identity, RNTI for short) of user
equipment, and N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs
included in the PDCCH.
[0247] In a specific embodiment, when a value of .DELTA. is 1, a
first-type pilot port that has an aggregation level 2 and is
determined by using the formula (1) is not the same as a first-type
pilot port occupied by another EPDCCH that has the aggregation
level 2 and occupies a different time-frequency resource.
[0248] When n'.sub.0=0, by using the formula (2), if n'.sub.1=1; if
n'.sub.0=1, n'.sub.1=0; if n'.sub.0=2, n'.sub.1=3; and if
n'.sub.0=3, n'.sub.1=2.
[0249] Alternatively, a value of .DELTA. is 2, and in this case, it
can be ensured that ports that correspond to DCI0 and DCI1 are in a
frequency division manner.
[0250] Specifically, the port index of the first-type pilot port
has a correspondence with a port number of the first-type pilot
port, and specifically, the correspondence may be shown in Table 1.
In Table 1, 107 to 110 represent port numbers separately.
TABLE-US-00001 TABLE 1 Normal cyclic prefix Normal subframe Special
subframe Special subframe configurations 3, 4, configurations 1, 2,
6, 7, Extended n' and 8 and 9 cyclic prefix 0 107 107 107 1 108 109
108 2 109 -- -- 3 110 -- --
[0251] In this embodiment, multiple pieces of DCI of same user
equipment may be transmitted on a same time-frequency resource, and
may be spatially multiplexed by using different first-type pilot
ports.
[0252] FIG. 7 is a schematic structural diagram of Embodiment 1 of
user equipment 70 according to an embodiment of the present
invention. As shown in FIG. 7, the user equipment 70 provided in
this embodiment of the present invention includes: an acquiring
module 701, a port determining module 702, and a detecting module
703.
[0253] The acquiring module 701 is configured to acquire a pilot
port determining parameter that corresponds to downlink control
information needing to be detected.
[0254] The port determining module 702 is configured to determine,
according to the pilot port determining parameter, a first-type
pilot port that corresponds to the downlink control
information.
[0255] The detecting module 703 is configured to detect the
downlink control information according to the first-type pilot
port.
[0256] The pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0257] The user equipment provided in this embodiment of the
present invention can be configured to perform the technical
solution shown in the embodiment of FIG. 1 of the present
invention. The implementation principle and technical effects
thereof are similar, and details are not described herein
again.
[0258] FIG. 8 is a schematic structural diagram of Embodiment 2 of
user equipment according to an embodiment of the present invention,
and this embodiment is implemented based on the embodiment of FIG.
7, and specifically as follows:
[0259] The format of the downlink control information is one of at
least one candidate format of the downlink control information.
[0260] The carrier index is an index of a carrier scheduled by
using the downlink control information.
[0261] Optionally, the user equipment 70 further includes: a first
parameter determining module 704, configured to: when the pilot
port determining parameter is determined according to the format of
the downlink control information,
[0262] determine a type of the downlink control information
according to the format of the downlink control information;
and
[0263] determine the pilot port determining parameter according to
the type of the downlink control information, where
[0264] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0265] Optionally, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0266] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0267] Optionally, the user equipment 70 further includes: a second
parameter determining module 705, configured to: when the pilot
port determining parameter is determined according to the format of
the downlink control information,
[0268] acquire a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0269] determine the pilot port determining parameter according to
the quantity of bits of the downlink control information.
[0270] Optionally, the second parameter determining module 705 is
further specifically configured to: when there are at least two
pieces of downlink control information needing to be detected,
[0271] determine a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0272] determine the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0273] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0274] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0275] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0276] Optionally, the carrier index includes at least one of the
following:
[0277] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0278] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0279] Optionally, the configuration information of the second-type
pilot includes any one or a combination of the following:
[0280] a quantity of ports for the second-type pilot;
[0281] power information of the second-type pilot;
[0282] a subframe offset at a moment when the second-type pilot is
sent; and
[0283] a subframe period at the moment when the second-type pilot
is sent.
[0284] Optionally, the second-type pilot is a channel state
information reference signal or a common pilot signal.
[0285] Optionally, the resource configuration information of the
downlink control information includes any one or a combination of
the following:
[0286] a size of a time-frequency resource of the downlink control
information;
[0287] a time domain position of a resource of the downlink control
information;
[0288] a frequency domain position of the resource of the downlink
control information; and
[0289] precoding information used by the downlink control
information.
[0290] Optionally, the port determining module 702 is specifically
configured to:
[0291] determine, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0292] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0293] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0294] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0295] The user equipment in this embodiment can be configured to
perform a technical solution of the method for detecting downlink
control information provided in any embodiment of the present
invention. The implementation principle and technical effects
thereof are similar, and details are not described herein
again.
[0296] FIG. 9 is a schematic structural diagram of Embodiment 1 of
a base station 90 according to an embodiment of the present
invention. The base station 90 provided in this embodiment includes
an acquiring module 901, a port determining module 902, and a
sending module 903.
[0297] The acquiring module 901 is configured to acquire a pilot
port determining parameter that corresponds to downlink control
information.
[0298] The port determining module 902 is configured to determine,
according to the pilot port determining parameter, a first-type
pilot port that corresponds to the downlink control
information.
[0299] The sending module 903 is configured to send the downlink
control information according to the first-type pilot port.
[0300] The pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0301] The base station in this embodiment can be configured to
perform a technical solution of the method for sending downlink
control information provided in the embodiment of FIG. 5 of the
present invention. The implementation principle and technical
effects thereof are similar, and details are not described herein
again.
[0302] FIG. 10 is a schematic structural diagram of Embodiment 2 of
a base station according to an embodiment of the present invention,
and this embodiment is based on the embodiment of FIG. 9, and
specifically as follows:
[0303] The format of the downlink control information is one of at
least one candidate format of the downlink control information.
[0304] The carrier index is an index of a carrier scheduled by
using the downlink control information.
[0305] Optionally, the base station 90 further includes: a first
parameter determining module 904, configured to: when the pilot
port determining parameter is determined according to the format of
the downlink control information,
[0306] determine a type of the downlink control information
according to the format of the downlink control information;
and
[0307] determine the pilot port determining parameter according to
the type of the downlink control information, where
[0308] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0309] Optionally, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0310] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0311] Optionally, the base station 90 further includes: a second
parameter determining module 905, configured to: when the pilot
port determining parameter is determined according to the format of
the downlink control information,
[0312] acquire a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0313] determine the pilot port determining parameter according to
the quantity of bits of the downlink control information.
[0314] Optionally, the second parameter determining module 905 is
further specifically configured to: when there are at least two
pieces of downlink control information needing to be detected,
[0315] determine a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0316] determine the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0317] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0318] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0319] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0320] Optionally, the carrier index includes at least one of the
following:
[0321] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0322] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0323] Optionally, the configuration information of the second-type
pilot includes any one or a combination of the following:
[0324] a quantity of ports for the second-type pilot;
[0325] power information of the second-type pilot;
[0326] a subframe offset at a moment when the second-type pilot is
sent; and
[0327] a subframe period at the moment when the second-type pilot
is sent.
[0328] Optionally, the second-type pilot is a channel state
information reference signal or a common pilot signal.
[0329] Optionally, the resource configuration information of the
downlink control information includes any one or a combination of
the following:
[0330] a size of a time-frequency resource of the downlink control
information;
[0331] a time domain position of a resource of the downlink control
information;
[0332] a frequency domain position of the resource of the downlink
control information; and
[0333] precoding information used by the downlink control
information.
[0334] Optionally, the port determining module 902 is specifically
configured to:
[0335] determine, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0336] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0337] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0338] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0339] The base station in this embodiment can be configured to
perform a technical solution of the method for sending downlink
control information provided in any embodiment of the present
invention. The implementation principle and technical effects
thereof are similar, and details are not described herein
again.
[0340] FIG. 11 is a schematic structural diagram of Embodiment 3 of
user equipment 110 according to an embodiment of the present
invention. As shown in FIG. 11, the user equipment 110 provided in
this embodiment includes a processor 1101 and a memory 1102. The
user equipment 110 may further include a transmitter 1103 and a
receiver 1104. The transmitter 1103 and the receiver 1104 may be
connected to the processor 1101. The transmitter 1103 is configured
to send data or information, the receiver 1104 is configured to
receive data or information, and the memory 1102 stores an
execution instruction; when the user equipment 110 runs, the
processor 1101 communicates with the memory 1102, and the processor
1101 invokes the execution instruction in the memory 1102 to
perform the following operations:
[0341] acquiring a pilot port determining parameter that
corresponds to downlink control information needing to be
detected;
[0342] determining, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information; and
[0343] detecting the downlink control information according to the
first-type pilot port, where
[0344] the pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0345] Optionally, the format of the downlink control information
is one of at least one candidate format of the downlink control
information; and
[0346] the carrier index is an index of a carrier scheduled by
using the downlink control information.
[0347] Optionally, the pilot port determining parameter is
determined according to the format of the downlink control
information, and the operations include:
[0348] determining a type of the downlink control information
according to the format of the downlink control information;
and
[0349] determining the pilot port determining parameter according
to the type of the downlink control information, where
[0350] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0351] Optionally, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0352] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0353] Optionally, the pilot port determining parameter is
determined according to the format of the downlink control
information, and the operations include:
[0354] acquiring a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0355] determining the pilot port determining parameter according
to the quantity of bits of the downlink control information.
[0356] Optionally, there are at least two pieces of downlink
control information needing to be detected, and the determining the
pilot port determining parameter according to the quantity of bits
of the downlink control information includes:
[0357] determining a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0358] determining the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0359] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0360] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0361] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0362] Optionally, the carrier index includes at least one of the
following:
[0363] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0364] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0365] Optionally, the configuration information of the second-type
pilot includes any one or a combination of the following:
[0366] a quantity of ports for the second-type pilot;
[0367] power information of the second-type pilot;
[0368] a subframe offset at a moment when the second-type pilot is
sent; and
[0369] a subframe period at the moment when the second-type pilot
is sent.
[0370] Optionally, the second-type pilot is a channel state
information reference signal or a common pilot signal.
[0371] Optionally, the resource configuration information of the
downlink control information includes any one or a combination of
the following:
[0372] a size of a time-frequency resource of the downlink control
information;
[0373] a time domain position of a resource of the downlink control
information;
[0374] a frequency domain position of the resource of the downlink
control information; and
[0375] precoding information used by the downlink control
information.
[0376] Optionally, the determining, according to the pilot port
determining parameter, a first-type pilot port that corresponds to
the downlink control information includes:
[0377] determining, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0378] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0379] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0380] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0381] The user equipment in this embodiment can be configured to
perform a technical solution of the method for detecting downlink
control information provided in any embodiment of the present
invention. The implementation principle and technical effects
thereof are similar, and details are not described herein
again.
[0382] FIG. 12 is a schematic structural diagram of Embodiment 3 of
a base station 120 according to an embodiment of the present
invention. As shown in FIG. 12, the base station 120 provided in
this embodiment includes a processor 1201 and a memory 1202. The
base station 120 may further include a transmitter 1203 and a
receiver 1204. The transmitter 1203 and the receiver 1204 may be
connected to the processor 1201. The transmitter 1203 is configured
to send data or information, the receiver 1204 is configured to
receive data or information, and the memory 1202 stores an
execution instruction; when the base station 120 runs, the
processor 1201 communicates with the memory 1202, and the processor
1201 invokes the execution instruction in the memory 1202 to
perform the following operations:
[0383] acquiring a pilot port determining parameter that
corresponds to downlink control information;
[0384] determining, according to the pilot port determining
parameter, a first-type pilot port that corresponds to the downlink
control information; and
[0385] sending the downlink control information according to the
first-type pilot port, where
[0386] the pilot port determining parameter is determined according
to at least one of the following: a format of the downlink control
information, a carrier index, configuration information of a
second-type pilot, resource configuration information of the
downlink control information, and a layer index of the downlink
control information.
[0387] Optionally, the format of the downlink control information
is one of at least one candidate format of the downlink control
information; and
[0388] the carrier index is an index of a carrier scheduled by
using the downlink control information.
[0389] Optionally, the pilot port determining parameter is
determined according to the format of the downlink control
information, and the operations include:
[0390] determining a type of the downlink control information
according to the format of the downlink control information;
and
[0391] determining the pilot port determining parameter according
to the type of the downlink control information, where
[0392] at least two different types of downlink control information
correspond to different pilot port determining parameters.
[0393] Optionally, the type of the downlink control information
includes a type of uplink scheduling control information and a type
of downlink scheduling control information; or
[0394] the type of the downlink control information includes a type
of common control information and a type of user specific control
information.
[0395] Optionally, the pilot port determining parameter is
determined according to the format of the downlink control
information, and the operations include:
[0396] acquiring a quantity of bits of the downlink control
information according to the format of the downlink control
information; and
[0397] determining the pilot port determining parameter according
to the quantity of bits of the downlink control information.
[0398] Optionally, there are at least two pieces of downlink
control information needing to be detected, and the determining the
pilot port determining parameter according to the quantity of bits
of the downlink control information includes:
[0399] determining a size relationship between quantities of bits
included in the at least two pieces of downlink control
information; and
[0400] determining the pilot port determining parameter of the
downlink control information according to the size relationship,
where
[0401] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is greater than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0402] a port index determined by using a pilot port determining
parameter that corresponds to downlink control information
including a larger quantity of bits is less than a port index
determined by using a pilot port determining parameter that
corresponds to downlink control information including a smaller
quantity of bits; or
[0403] downlink control information including a same quantity of
bits corresponds to a same pilot port determining parameter.
[0404] Optionally, the carrier index includes at least one of the
following:
[0405] a carrier index of a first carrier on which the downlink
control information needing to be detected is located; and
[0406] a carrier index of a second carrier scheduled, during
cross-carrier scheduling, by the downlink control information that
is on the first carrier.
[0407] Optionally, the configuration information of the second-type
pilot includes any one or a combination of the following:
[0408] a quantity of ports for the second-type pilot;
[0409] power information of the second-type pilot;
[0410] a subframe offset at a moment when the second-type pilot is
sent; and
[0411] a subframe period at the moment when the second-type pilot
is sent.
[0412] Optionally, the second-type pilot is a channel state
information reference signal or a common pilot signal.
[0413] Optionally, the resource configuration information of the
downlink control information includes any one or a combination of
the following:
[0414] a size of a time-frequency resource of the downlink control
information;
[0415] a time domain position of a resource of the downlink control
information;
[0416] a frequency domain position of the resource of the downlink
control information; and
[0417] precoding information used by the downlink control
information.
[0418] Optionally, the determining, according to the pilot port
determining parameter, a first-type pilot port that corresponds to
the downlink control information includes:
[0419] determining, according to a formula (1) or a formula (2), a
port index of the first-type pilot port that corresponds to the
downlink control information, where
[0420] the formula (1) is:
n'.sub.1=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (1); and
[0421] the formula (2) is:
n'.sub.1=(n.sub.0+.DELTA.)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), (2); where
[0422] n'.sub.0=n.sub.ECCE,low mod
N.sub.RB.sup.ECCE+(n.sub.RNTI)mod
min(N.sub.EPDCCH.sup.ECCE,N.sub.RB.sup.ECCE), .DELTA. is the pilot
port determining parameter, .DELTA..gtoreq.0, .DELTA. is an
integer, n'.sub.1 is the port index of the first-type pilot port,
the port index of the first-type pilot port has a correspondence
with a port number of the first-type pilot port, n.sub.ECCE,low is
a reference sign of a minimum enhanced control channel element ECCE
at which an enhanced physical downlink control channel EPDCCH is
located, N.sub.RB.sup.ECCE is a quantity of ECCEs included in each
physical resource block pair, n.sub.RNTI is a value of a radio
network temporary identity RNTI of user equipment, and
N.sub.EPDCCH.sup.ECCE is a quantity of ECCEs included in the
EPDCCH.
[0423] The base station in this embodiment can be configured to
perform a technical solution of the method for sending downlink
control information provided in any embodiment of the present
invention. The implementation principle and technical effects
thereof are similar, and details are not described herein
again.
[0424] In the several embodiments provided in the present
application, it should be understood that the disclosed device and
method may be implemented in other manners. For example, the
described device embodiment is merely exemplary. For example, the
unit or module division is merely logical function division and may
be other division in actual implementation. For example, a
plurality of units or modules may be combined or integrated into
another system, or some features may be ignored or not performed.
In addition, the displayed or discussed mutual couplings or direct
couplings or communication connections may be implemented through
some interfaces. The indirect couplings or communication
connections between the devices or modules may be implemented in
electronic, mechanical, or other forms.
[0425] The modules described as separate parts may or may not be
physically separate, and parts displayed as modules may or may not
be physical modules, may be located in one position, or may be
distributed on a plurality of network units. Some or all of the
modules may be selected according to actual needs to achieve the
objectives of the solutions of the embodiments.
[0426] Persons of ordinary skill in the art may understand that all
or some of the steps of the method embodiments may be implemented
by a program instructing relevant hardware. The program may be
stored in a computer-readable storage medium. When the program
runs, the steps of the method embodiments are performed. The
foregoing storage medium includes: any medium that can store
program code, such as a ROM, a RAM, a magnetic disc, or an optical
disc.
[0427] Finally, it should be noted that the foregoing embodiments
are merely intended for describing the technical solutions of the
present invention, but not for limiting the present invention.
Although the present invention is described in detail with
reference to the foregoing embodiments, persons of ordinary skill
in the art should understand that they may still make modifications
to the technical solutions described in the foregoing embodiments
or make equivalent replacements to some or all technical features
thereof, without departing from the scope of the technical
solutions of the embodiments of the present invention.
* * * * *